Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5f51d61f11d6f9…

MALICIOUS

PDF

85.4 KB Created: 2021-07-20 21:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f608176a7533c4b3e58e05b67572104 SHA-1: 66b961ccdce635ac21bf943dd89a2b17795d3b12 SHA-256: ff5f51d61f11d6f972664a38011c06be11b75c6905debee9a0e45e2631b4fedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs are designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://iburgisidimarsala.eu/userfiles/files/50478984652.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b852f21ba21---84220764826.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/24a78fa45dc1903d8ac41f75aef6af19/67220179880.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lizavasez.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210626001419.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e88dc65d---gewumiridogimobifewax.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a38e9d802e6629e7e68f6b647128711/lazojuregegu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27b3014955---10047227423.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/dilapavagewutozililaxe.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed5a50b3a---tafejikexazamisoduwevi.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/bedegawaw.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/bepobapor.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/vujajajodebalog.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd6201dc4---sirotekafalifimiku.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85628196389.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/magumovuzumubefakoritigil.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/84898965705.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/rerituzonef.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074181e33dc4---mizezaxavirodejabafusove.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b65347dd0---320175600.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/jidazinupobemasixiz.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b8310425b259298586ca023f67a47398/lofofalonolegufomofiz.pdfIn PDF document text
    • http://soles2walk.cz/data/file/68899234398.pdfIn PDF document text
    • https://digireg.lu/upload/bazule.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d224785528---tabikoxofesusesebusige.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/17776004288.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/kqmbcjtb5ug7983mvhmetmr0vl/9237274275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lewis+structure+for+c2f2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 10280 bytes
SHA-256: 721d6068b64f8f93cbec35a177e0fc3cb5d50b211cbf6bdb77523e638b61f811
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 17024 bytes
SHA-256: 9c965b4e0c43ada21c95baa42363410cb24d75f4ffe789c70f584c1c68749ec3
font_02_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 16164 bytes
SHA-256: 3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579